Immediately prior to joining the full-time Law Center faculty in 2007, Professor Sirota was an attorney for the Professional Responsibility Advisory Office of the U.S. Department of Justice, where she advised and trained lawyers on professional responsibility issues in criminal and civil matters. She also taught Professional Responsibility as an adjunct faculty member.

Previously, Professor Sirota was Counsel for Ethics and Administration for the Environment and Natural Resources Division of the Department of Justice. Before joining the government, she was a partner at Baach Robinson & Lewis, where she practiced civil litigation. Professor Sirota also served for six years as an appointed hearing committee member for the District of Columbia Board on Professional Responsibility.